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<title>GNU Scientific Library – Reference Manual: Matrix operations</title>
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<a name="Matrix-operations"></a>
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Next: <a href="Finding-maximum-and-minimum-elements-of-matrices.html#Finding-maximum-and-minimum-elements-of-matrices" accesskey="n" rel="next">Finding maximum and minimum elements of matrices</a>, Previous: <a href="Exchanging-rows-and-columns.html#Exchanging-rows-and-columns" accesskey="p" rel="previous">Exchanging rows and columns</a>, Up: <a href="Matrices.html#Matrices" accesskey="u" rel="up">Matrices</a> [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Matrix-operations-1"></a>
<h4 class="subsection">8.4.10 Matrix operations</h4>
<p>The following operations are defined for real and complex matrices.
</p>
<dl>
<dt><a name="index-gsl_005fmatrix_005fadd"></a>Function: <em>int</em> <strong>gsl_matrix_add</strong> <em>(gsl_matrix * <var>a</var>, const gsl_matrix * <var>b</var>)</em></dt>
<dd><p>This function adds the elements of matrix <var>b</var> to the elements of
matrix <var>a</var>. The result <em>a(i,j) \leftarrow a(i,j) + b(i,j)</em>
is stored in <var>a</var> and <var>b</var> remains unchanged. The two matrices
must have the same dimensions.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fmatrix_005fsub"></a>Function: <em>int</em> <strong>gsl_matrix_sub</strong> <em>(gsl_matrix * <var>a</var>, const gsl_matrix * <var>b</var>)</em></dt>
<dd><p>This function subtracts the elements of matrix <var>b</var> from the
elements of matrix <var>a</var>. The result <em>a(i,j) \leftarrow a(i,j)
- b(i,j)</em> is stored in <var>a</var> and <var>b</var> remains unchanged. The two
matrices must have the same dimensions.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fmatrix_005fmul_005felements"></a>Function: <em>int</em> <strong>gsl_matrix_mul_elements</strong> <em>(gsl_matrix * <var>a</var>, const gsl_matrix * <var>b</var>)</em></dt>
<dd><p>This function multiplies the elements of matrix <var>a</var> by the
elements of matrix <var>b</var>. The result <em>a(i,j) \leftarrow a(i,j)
* b(i,j)</em> is stored in <var>a</var> and <var>b</var> remains unchanged. The two
matrices must have the same dimensions.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fmatrix_005fdiv_005felements"></a>Function: <em>int</em> <strong>gsl_matrix_div_elements</strong> <em>(gsl_matrix * <var>a</var>, const gsl_matrix * <var>b</var>)</em></dt>
<dd><p>This function divides the elements of matrix <var>a</var> by the elements
of matrix <var>b</var>. The result <em>a(i,j) \leftarrow a(i,j) /
b(i,j)</em> is stored in <var>a</var> and <var>b</var> remains unchanged. The two
matrices must have the same dimensions.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fmatrix_005fscale"></a>Function: <em>int</em> <strong>gsl_matrix_scale</strong> <em>(gsl_matrix * <var>a</var>, const double <var>x</var>)</em></dt>
<dd><p>This function multiplies the elements of matrix <var>a</var> by the
constant factor <var>x</var>. The result <em>a(i,j) \leftarrow x a(i,j)</em>
is stored in <var>a</var>.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fmatrix_005fadd_005fconstant"></a>Function: <em>int</em> <strong>gsl_matrix_add_constant</strong> <em>(gsl_matrix * <var>a</var>, const double <var>x</var>)</em></dt>
<dd><p>This function adds the constant value <var>x</var> to the elements of the
matrix <var>a</var>. The result <em>a(i,j) \leftarrow a(i,j) + x</em> is
stored in <var>a</var>.
</p></dd></dl>
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